Tactics for complex battles.

I found a thread about HoMM3 where complex battles are described turn by turn. I would like to ask the champions of the 5th part to do the same, for example, how to defeat as many neutral creatures as possible on the hero difficulty in the first week. For example, when playing as Demons or Haven, you need to defeat the horde of Dryads guarding the lumber mill/mine, and it's frustrating that they can't be defeated without significant losses in the first week. And by the time you build level 3-4 units (maybe in the beginning of the 2nd week, if you're lucky with resources), the enemies are already building level 5, or even level 6 units. Well, you get the idea. Thanks in advance. Sincerely, Slash.